Patterns of Evolution Gradualism Punctuated Equilibrium Divergent and More - Free Printable

Let’s go step by step to fill in the table correctly.

We are given a list of events or changes, and we need to decide whether each one is an example of:
- Evolution (change over generations in a population)
- Emergent (a new property that appears when parts interact — not present in individual parts)
- Developmental (changes within one organism’s lifetime as it grows)
- Co-Evolution (two species evolving together because they affect each other)

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1. The first known vertebrate land animal was *Tiktaalik*. It had fish-like features but also limbs with digits. Its descendants evolved into amphibians, reptiles, birds, and mammals.

→ This is about how a group changed over many generations to become different kinds of animals. That’s evolution.

✔ Answer: Evolution

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2. A single fertilized egg cell divides many times to form a human baby. The cells become specialized — some become muscle, some become nerve cells, etc.

→ This happens inside one living thing as it grows from baby to adult. That’s developmental.

✔ Answer: Developmental

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3. Bees and flowers have evolved together. Flowers developed bright colors and sweet nectar to attract bees. Bees developed long tongues to reach nectar and bodies that pick up pollen.

→ Two species changing because of each other? That’s co-evolution.

✔ Answer: Co-Evolution

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4. Ants live in colonies. No single ant can build a nest, find food, or defend the colony alone. But together, the colony acts like a superorganism — finding food, building nests, protecting young.

→ The “superorganism” behavior isn’t in any one ant — it emerges when they work together. That’s emergent.

✔ Answer: Emergent

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5. Over millions of years, whales evolved from land mammals. Their front legs became flippers, their back legs disappeared, and they developed blowholes on top of their heads.

→ Change over many generations in a population → evolution.

✔ Answer: Evolution

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6. A caterpillar eats leaves, then forms a chrysalis, and turns into a butterfly. The body completely reorganizes — wings grow, legs change shape, mouthparts change.

→ This is all happening in one insect’s life cycle → developmental.

✔ Answer: Developmental

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7. Some bacteria became resistant to antibiotics. When doctors used penicillin, most bacteria died, but a few survived because they had genes that made them resistant. Those resistant bacteria multiplied.

→ Population changed over time due to survival of certain traits → evolution.

✔ Answer: Evolution

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8. Birds migrate south for winter. They don’t learn this from parents — it’s built into their brains. Even if raised alone, they still fly south at the right time.

→ This is instinctive behavior shaped over generations → evolution.

✔ Answer: Evolution

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9. Human babies are born helpless. They can’t walk, talk, or feed themselves. Over months and years, they grow stronger, learn to speak, and become independent.

→ Changes within one person’s lifetime → developmental.

✔ Answer: Developmental

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10. Coral reefs are made of tiny coral polyps. Each polyp is simple, but together they build huge structures that support thousands of other species — fish, crabs, algae.

→ The reef ecosystem is more than just the sum of polyps — it’s a complex system that emerges from their interaction → emergent.

✔ Answer: Emergent

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11. Cheetahs evolved to run fast to catch gazelles. Gazelles evolved to run faster to escape cheetahs. This arms race continues today.

→ Two species pushing each other to change → co-evolution.

✔ Answer: Co-Evolution

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12. A seed germinates, grows roots and leaves, becomes a plant, makes flowers, produces seeds, and dies. All these stages happen in one plant’s life.

→ Life cycle of one organism → developmental.

✔ Answer: Developmental

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13. In a forest, trees compete for sunlight. Taller trees get more light. Over time, the average height of trees in the forest increases.

→ Population trait (height) changes over generations → evolution.

✔ Answer: Evolution

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14. Antifreeze proteins in Arctic fish prevent ice crystals from forming in their blood. These proteins didn’t exist in their ancestors — they evolved after the ocean got colder.

→ New trait appearing in a population over time → evolution.

✔ Answer: Evolution

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15. When you touch something hot, your hand pulls away before you even feel pain. Your spinal cord handles this reflex without waiting for your brain.

→ This is a built-in response that helps you survive — shaped by evolution → evolution.

Wait — actually, let’s think again. Is this about change over generations? Or is it about how your body works right now?

This reflex is part of your nervous system’s design — it’s not changing during your life, nor is it emerging from interactions. It’s a trait that evolved over time to protect you.

So yes — evolution.

But wait — could it be developmental? No, because it’s not about growth. Could it be emergent? Not really — it’s a direct neural pathway.

Actually, this is tricky. Let me double-check.

The question says: “When you touch something hot...” — this is describing a physiological mechanism that exists in humans because of evolutionary pressure. So it’s best classified as evolution — the trait evolved to help survival.

✔ Final decision: Evolution

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Now let’s compile the answers:

1. Evolution
2. Developmental
3. Co-Evolution
4. Emergent
5. Evolution
6. Developmental
7. Evolution
8. Evolution
9. Developmental
10. Emergent
11. Co-Evolution
12. Developmental
13. Evolution
14. Evolution
15. Evolution

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Final Answer:
1. Evolution
2. Developmental
3. Co-Evolution
4. Emergent
5. Evolution
6. Developmental
7. Evolution
8. Evolution
9. Developmental
10. Emergent
11. Co-Evolution
12. Developmental
13. Evolution
14. Evolution
15. Evolution